Mother well shaft and rocket: what they have in common

1. Step 1. Mother well shaft — is part of — Qanat. A vertical shaft down to the aquifer.
2. Step 2. Qanat — is made of — Clay. Weak sections of a qanat were reinforced with clay rings.
3. Step 3. Clay — is material for — Grenade. Medieval grenades were ceramic vessels.
4. Step 4. Grenade — uses — Gunpowder. An explosive.
5. Step 5. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.

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